Journal
PHYSICAL REVIEW A
Volume 88, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.88.014301
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Funding
- Science Fund for Creative Research Groups, National Natural Science Foundation of China [10721101]
- National Center for Mathematics and Interdisciplinary Sciences, Chinese Academy of Sciences [Y029152K51]
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We propose an entanglement criterion in terms of quantum Fisher information, which complements the criterion based on variance and local uncertainty relations [H. F. Hofmann and S. Takeuchi, Phys. Rev. A 68, 032103 (2003)]. We illustrate the significance of this criterion by showing that it can reveal entanglement undetectable by the variance method. The dual relation between the criterion based on quantum Fisher information and that based on variance are highlighted. The combination of these two criteria leads to a refined method for entanglement detection, which is stronger than when either one is used alone.
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